World champion collided with Nico Rosberg on first lap of Sunday's race

Lauda claims Hamilton was 'too aggressive' as he tried to overtake

Both drivers were summoned to see stewards after the race in Catalunya

Formula One championship leader Nico Rosberg's hopes of an eighth win in a row disappeared on Sunday after a collision with Mercedes team-mate Lewis Hamilton on the opening lap of the Spanish Grand Prix.

Britain's triple world champion Hamilton had started on pole position, with Rosberg alongside on the front row at the Circuit de Catalunya.

The German, aiming to make it five successive wins for the season, passed Hamilton around the outside of turn one and the Briton was then squeezed on to the grass as he tried to regain the lead at turn three.

Niki Lauda has criticised Lewis Hamilton's aggression after the Mercedes driver collided with his team-mate Nico Rosberg on the first lap of the Spanish Grand Prix

The crash dramatically forced both drivers out of the race at the Circuit de Barcelona-Catalunya on Sunday

Lauda branded the incident as 'stupid', while Hamilton and Rosberg were summoned by stewardsHis car skewed sideways and smashed into Rosberg's, with both drivers ending up in the gravel and the safety car deployed.

Watching Daimler chief executive Dieter Zetsche shook his head in dismay, while Hamilton threw his steering wheel out of the car.

The pair returned to the paddock on scooters and trudged up the stairs for a debrief with Mercedes team bosses, motorsport head Toto Wolff hot on their heels. The drivers were also summoned to see the stewards after the race.

The team's non-executive chairman Niki Lauda, a triple world champion himself, blamed Hamilton before going to see the drivers.

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After losing first place early on lap one, Hamilton tried to recover top spot but was forced onto the grass

The world champion appeared to lose control after going off the track and his car turned sideways

Hamilton's Mercedes collided with his team-mate's car and both slid onto the gravel on the side of the track

'It is stupid, we could've won this race,' the Austrian told the BBC. 'Lewis is too aggressive. I need to talk to them and hear their explanation and then we will see what happens.'

Wolff, who has had to bang heads together before now, was more cautious than his compatriot.

'Niki has a driver's opinion and it's fair enough. As a driver you see it in black and white,' he said.

'From a team's perspective we've looked at the pictures and the data and it's not clear cut. Nico had a really good turn one and turn two, Lewis tried to dive in, Nico closed the door.

'I'd say let's wait and see what the stewards say. It's not a situation where you can attribute 100 percent of the blame.'

Hamilton threw the steering wheel from his car before leaving the scene of the crash on a scooter

The two Mercedes cars are loaded onto trailers and removed from the circuit in Spain

The front of Hamilton's car shows the extent of the damage caused by the collision with Rosberg

Rosberg still has a comfortable lead in the championship standings, being 43 points clear of closest rival Hamilton before Sunday's race.

However, the collision ended Mercedes hopes of extending the team's winning run to 11 races and equalling McLaren's 1988 record streak of success.

Only one driver in the modern era has won eight consecutive races -- Germany's Sebastian Vettel, with nine in a row in 2013 for Red Bull -- but Rosberg had hopes of continuing his run after winning at the circuit last year.

Victory would also have made him only the third F1 driver after compatriot Michael Schumacher and Britain's Nigel Mansell to win the first five races of a season.